Sleep sex!

I'm pretty sure this has a different name but who does it? I've been wanting to lately with my bf but I get nervous to get things started as he's asleep because ....idk because he's not conscious! We've talked about it. He's definitely into it so there's consent. But yeah idk how to get the ball rolling. I started feeling him up in the middle of the night. He got hard but he was still sleeping so idk I got nervous and turned over lol. But he woke up shortly after and we banged but he didn't know that what started it was me feeling him up. So if I start blowing him will it wake him up? What do you personally do? I'm new to this so don't make fun of me! Lol